I have found a fairly reliable way to jump the fence in Paris. Unlike
in LA and the other Paris method I've read, you don't need to use
remote bombs. This method works on your car's inertia alone!

You need to play as Twister, because of her speed.

Turn on god mode  it takes many attempts to leap the fence
successfully and you use a lot of turbo in the process.

Starting at the Louvre, drive towards the Eiffel Tower until you're
about to cross the river, and turn left 45 degrees. Then drive forward
 you'll come to a corner. This is the corner where fence jumping is
possible.

Point your car directly into the corner. You want the corner to be
exactly in front of the car. If you drive into the corner and hit it,
the collision will help center it.

Once you're centered (and making sure you're still at about a
45-degree angle), back up in a straight line. If you started at a 45
degree angle, then as you back up you'll see a bridge on your left,
then you'll start to go down into the river, then you'll see the
fountains on your right.

The angle needs to put you as close as possible to the bridge
without actually hitting it as you back up. Using the helicopter view
helps in judging this. See how close you are to the bridge, then
adjust your angle by driving forward into the corner, turning the car
a little to the right or left, driving into the corner again to
"recenter", then rotate again because it turned a little when you hit.

Now you're ready to try a jump. Back up straight, across the river
and up the slope on the opposite bank. You want to start from a dead
stop, as high up on this slope as possible but not at street level 
as long as the car is tilted down you're OK.

Hit the turbo and hold it. The car will go down, across the river,
up the other side and leap!  and about 5-10% of the time, will
sail right over the edge and land outside!

If you don't sail over the edge, just try again.

There's another corner positioned on the right side of the Eiffel
Tower, and I suppose the same technique might work there too. I
haven't tried it.

Once you're outside the fence you can:

Get a full view of the Eiffel Tower as you detonate it.

Launch napalms and watch them fall way, way below the ground, then
mysteriously explode near the horizon some distance in front of you.

Taunt your enemies and (if you're close enough) watch them wipe each
other out until only one remains.

Attack your enemies with ricochet bombs  all other weapons except
Spectre's and Shadow's specials will impact on the "fence" but
ricochet bombs go through.

Drive forever in one direction just to see if it's possible to go
"too far". I haven't had the patience to do this for more than about 5
minutes, and nothing strange happened. Note: if you get lost, you can
use the radar to find your way back.

If you want to drive back into the arena, it's best to do so by going
through a transparent barrier  in other words, jump over the visible
walls. Use a remote bomb to jump yourself up and turbo forwards. If
you try to just drive straight through a visible wall you will often
get "stuck" rattling back and forth on the boundary, half-in and
half-out.

Also sometimes you get "stuck" in the boundary while trying to jump
out, particularly in the Paris method I just described. When you're
stuck in this particular corner I've found that rotating left or right
while holding turbo will usually get you unstuck.

You can even get "stuck" in the wall by getting attacked while backed
into a corner. This is how I first got the idea of trying to get
through that corner in Paris  I was attacked by several enemies at
once and ended up rattling inside the corner, then used turbo to get
unstuck and ended up outside the arena.

Crash Bandicoot: Warped

On level 3 "Orient Express", if you're holding the square button to
make the tiger run faster, you don't have to jump over most of the
gaps. Apparently the tiger is running so fast he takes the gap in one
stride. There is just one place is the level where I had to let up on
the square button, and that was on the second "springboard"  if you
want to take the springboard you have to take it at normal speed,
otherwise the tiger can't get high enough before reaching the wall.
(And boy, when that tiger hits the wall, he really hits the wall!)

Bugs Bunny Lost In Time

This is perhaps the most satisfying game I have played (although I
haven't played many). The main reason is that they seem to have made
it a little easier to work through than other similar games (like
Crash 3). The artwork (both 2-D backgrounds and 3-D rendered objects)
is great because of its similarity to the classic Warner Brothers
cartoons. They seem to have put a lot of effort into using the classic
cartoons as a guide whenever possible and this makes the whole thing
seem a lot less "made-up", a problem that I have noticed with most
other games.

I've only gone 35% of the way through the game, but so far I haven't
been frustrated by much. In Crash 3 I had to leave a number of levels
(most notably the scuba diving levels) incomplete.

Starting at about the 30% point you will begin to find lots of things
to jump on that you cannot use because you don't have a special
ability yet. Also, other levels appear to be unsolvable for no
apparent reason. At about the same point you will probably also notice
that a whole lot of new levels open up all at once. Thus, you have a
lot of work to do to figure out what levels should be done first to
get the special abilities you need to finish the other levels.

Wipeout XL

To get ships that look like animals (bees, snails, etc.) reset the
Plaaystation, and hold L1 + R2 + SELECT + START until you get the
first graphic "Wipeout XL" screen.

More tracks:

At main menu hold L1+R1+SELECT while entering [] () /\ () []. Note
that some of the tracks do not appear unless you select a more
advanced class.

Piranha team:

This team (ship) has the maximum possible value of all attributes
(thrust, top speed, turning ability, shield energy and aerodynamics).
At main menu hold L1+R1+SELECT while entering >< >< >< >< () /\ []

This code equips your ship with machine guns. Make sure weapons are
enabled in Main menu -> Options -> Preferences. During a game, pause
(SELECT+START). Then hold L1+R1+SELECT while entering
[] () >< [] () >< /\. To fire the guns, press O. If nothing happens,
go back to the main menu and see if you disabled weapons.

This game has the very nice feature that it can be made very simple or
very complex based on the option settings. Few games seem to control
difficulty this way, choosing instead to adjust speeds or amounts of
things while leaving all game elements in place.

To learn how to steer the ship, use the "infinite time" code above
(only works in "arcade" mode, not "time trial").

The simplest mode of play, and the place to start if you find the
other modes overwhelming or too dependent on random luck, is the "time
trial". In this mode there are no other ships to run into, and no
weapons (which are useless without other ships anyway). The time trial
mode is an easy way to get to know the course, which you need to do if
you're going to do well with competitors.

Then switch to arcade mode and turn weapons off. (Main menu -> Options
-> Preferences -> Weapons off.) This disables all the power-ups you
fly over except the blue arrows which give you a boost of speed.
Playing this way, after you know the course, lets you learn how to
deal with collisions and avoid getting pushed into the wall by
enemies.

This might be a good point to choose what type of ship you want to fly
(chosen by the "team" setting in Options). Whenever you change your
ship you have to relearn the course (particularly on the tough
courses) because your timing on tight curves has to agree with your
ship's reaction time.

Once you can breeze through arcade mode with weapons off, turn weapons
on and play Wipeout XL the way it was intended.

South Park

In God mode you can rack up points on pretty nearly any level that has
tanks by killing the tanks' minions without killing the tanks. This is
easiest in the robot factory (Level 4 Stage 2): Jump up onto the
conveyor belt, get inside the machine and face out, and keep killing
the new robots as they appear. The Warpo Ray will allow you to get
about 48,000 points per minute (or 69 million per day) this way. I
left it running a few weeks and ran the score up to 1,654,200,000.
Invincibility does not last forever  in my tests it has ended at
some point between 12.9 million and 14.6 million (however, I think
it's probably a time-based condition, not score-based).

You might notice that the "core" in the alien spaceship (the end of
Level 3 Stage 3) has no gravity  you can point in any direction you
want (including up and down) and move in that direction, even if that
means your "feet" would be off the ground. While you're checking
this out, make sure to shoot some toilet plungers at the energy ball,
just to see them stick to it, rotate for a while and then fall off.

Here's my list of the cheat codes. There are plenty of other lists
like this but hey, mine's in alphabetical order by the name of the
character! (-:

Resort (level "4b"  this level was added to the game in October
2010 along with the Game Center features.)

(music: Angel Rain - instrumental)

50cm

1m

1m 80cm

2m 30cm

3m 40cm

5m 70cm

7m 70cm

20m

30m

max: 36m 88cm6mm (73.8× larger)

Island (level 5)

(music: Katamari on the Rocks - Dokaka)

30m

45m

60m

90m

135m

200m

300m

500m

max: 764m 58cm0mm (25.5× larger)

Levels 1, 4, and 5 (Residence, Town, Island) could hypothetically be
linked together in sequence, because the largest possible katamari
size in each is a little bigger than the start size for the next.
Based on the maximum possible size in Island, the total growth in
diameter across the entire game is 15291.6× (which is 3.6×1012
in volume).

Other music:

Overture (from KD soundtrack, track 3) (used in the opening
splash screen that has a rainbow)